fix: set working directory in nsenter for relative path support

[wipash]

Summary

The execute_code tool description in LibreChat doesn't specify that files must be written to /mnt/data. This PR makes that the default so the LC agent doesn't have to endure a write failure and try to work it out by itself.

Code executed via the API now runs with /mnt/data as the working directory, allowing relative file paths to work correctly.

Also, includes a change to loosen up the is_fork ci check, so that PRs within a forked repo can still trigger builds.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Documentation update

How Has This Been Tested?

• just test-k8s
• deployed and tested in test cluster

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[github-actions]

🎉 This PR is included in version 2.1.2 🎉

The release is available on GitHub release

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